Yesterday was no ordinary Tuesday. It was Microsoft’s eleventh Patch Tuesday of 2011. In keeping with Microsoft’s practice of releasing a lower volume of patches during odd-numbered months as compared to even ones, this month’s Patch Tuesday only contains four security bulletins, which is half of what the company shipped in October.
Duqu aside, the most important security update this month happens to be MS11-083. It carries Microsoft’s highest severity rating - critical. The vulnerability it addresses can be used to “allow remote code execution if an attacker sends a continuous flow of specially crafted UDP packets to a closed port on a target system.”